161415881 has 8 divisors (see below), whose sum is σ = 178320000. Its totient is φ = 144883440.

The previous prime is 161415847. The next prime is 161415883. The reversal of 161415881 is 188514161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161415881 is a prime.

It is a super-2 number, since 2×161415881² = 52110173278012322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161415883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92006 + ... + 93743.

It is an arithmetic number, because the mean of its divisors is an integer number (22290000).

Almost surely, 2^161415881 is an apocalyptic number.

161415881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161415881 is a deficient number, since it is larger than the sum of its proper divisors (16904119).

161415881 is a wasteful number, since it uses less digits than its factorization.

161415881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185839.

The product of its digits is 7680, while the sum is 35.

The square root of 161415881 is about 12704.9549782752. The cubic root of 161415881 is about 544.4801945596.

It can be divided in two parts, 16141 and 5881, that added together give a palindrome (22022).

The spelling of 161415881 in words is "one hundred sixty-one million, four hundred fifteen thousand, eight hundred eighty-one".